Stuart M. Holmes
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View article: High-Efficiency, Lightweight, and Reliable Integrated Structures—The Future of Fuel Cells and Electrolyzers
High-Efficiency, Lightweight, and Reliable Integrated Structures—The Future of Fuel Cells and Electrolyzers Open
The high efficiency, light weight, and reliability of hydrogen energy electrochemical equipment are among the future development directions. Membrane electrode assemblies (MEAs) and electrolyzers, as key components, have structures and str…
View article: Nanofiber membranes for enhanced performance and optimization of proton exchange membrane fuel cells
Nanofiber membranes for enhanced performance and optimization of proton exchange membrane fuel cells Open
Proton exchange membranes (PEMs) are critical to fuel cell performance, where ion transport, catalyst activity, and mass transfer determine efficiency and durability. However, conventional membranes in PEM fuel cells often suffer from hydr…
View article: Correlating Structural Variation with Catalytic Performance of Hierarchical Zeolites Using Ultra‐High‐Field Solid‐State NMR
Correlating Structural Variation with Catalytic Performance of Hierarchical Zeolites Using Ultra‐High‐Field Solid‐State NMR Open
Ultra‐high‐field solid‐state NMR spectroscopy (1.0 GHz, 23.5 T) was employed to reveal the structural evolution of aluminum species and thus their correlations to catalytic cracking performance of Y zeolites after post‐synthetic treatments…
View article: Decoupling Membrane Electrode Assembly Materials Complexity from Fuel Cell Performance through Image‐Based Multiphase and Multiphysics Modelling
Decoupling Membrane Electrode Assembly Materials Complexity from Fuel Cell Performance through Image‐Based Multiphase and Multiphysics Modelling Open
Proton exchange membrane fuel cells (PEMFCs) are important clean energy technology, yet the material and structural complexity of their membrane electrode assemblies (MEAs) can hamper the development of next‐generation structures, as even …
View article: Durable Proton Exchange Membrane Based on Polymers of Intrinsic Microporosity for Fuel Cells
Durable Proton Exchange Membrane Based on Polymers of Intrinsic Microporosity for Fuel Cells Open
High‐temperature proton exchange membrane fuel cells (HT‐PEMFCs) is regarded as a promising energy conversion system owing to simplified water management and enhanced tolerance to fuel impurities. However, phosphoric acid (PA) leaching rem…
View article: Crystalline, Magnetic and Optical Properties of the CaLaSnFeO6 Perovskite
Crystalline, Magnetic and Optical Properties of the CaLaSnFeO6 Perovskite Open
In order to obtain new materials with multifunctional properties, CaLaSnFeO 6 samples were synthesized by the solid reaction technique. Structural analysis was performed by X-ray diffraction technique. Rietveld refinement of the experiment…
View article: Laser scribed proton exchange membranes for enhanced fuel cell performance and stability
Laser scribed proton exchange membranes for enhanced fuel cell performance and stability Open
View article: Improving the performance and long-term durability of high-temperature PEMFCs: A polyvinylpyrrolidone grafting modification strategy of polybenzimidazole membrane
Improving the performance and long-term durability of high-temperature PEMFCs: A polyvinylpyrrolidone grafting modification strategy of polybenzimidazole membrane Open
View article: Bioproduction of cerium-bearing magnetite and application to improve carbon-black supported platinum catalysts
Bioproduction of cerium-bearing magnetite and application to improve carbon-black supported platinum catalysts Open
View article: Catalytic pyrolysis of high-density polyethylene (HDPE) over hierarchical ZSM-5 zeolites produced by microwave-assisted chelation-alkaline treatment
Catalytic pyrolysis of high-density polyethylene (HDPE) over hierarchical ZSM-5 zeolites produced by microwave-assisted chelation-alkaline treatment Open
A new microwave (MW) assisted chelation-alkaline strategy was developed to produce hierarchical ZSM-5 zeolites (with external surface area of 203 m2/g) in minutes, leading to the formation of heterogeneous structure with a high-silica shel…
View article: Operando synchrotron-based X-ray study and intervention approaches of graphene-related-materials for investigating the performance and durability of HT-PEMFC
Operando synchrotron-based X-ray study and intervention approaches of graphene-related-materials for investigating the performance and durability of HT-PEMFC Open
The application of high-temperature proton exchange membrane fuel cells (HT-PEMFCs) addresses challenges in water management, fuel purity, and overheating under high current density. However, phosphoric acid (PA) migration hinders their de…
View article: A Doping‐Induced SrCo<sub>0.4</sub>Fe<sub>0.6</sub>O<sub>3</sub>/CoFe<sub>2</sub>O<sub>4</sub> Nanocomposite for Efficient Oxygen Evolution in Alkaline Media
A Doping‐Induced SrCo<sub>0.4</sub>Fe<sub>0.6</sub>O<sub>3</sub>/CoFe<sub>2</sub>O<sub>4</sub> Nanocomposite for Efficient Oxygen Evolution in Alkaline Media Open
Perovskite and spinel oxides are promising alternatives to noble metal‐based electrocatalysts for oxygen evolution reaction (OER). Herein, a novel perovskite/spinel nanocomposite comprised of SrCo 0.4 Fe 0.6 O 3 and CoFe 2 O 4 (SCF/CF) is …
View article: Anchoring highly dispersed metal nanoparticles by strong electrostatic adsorption (SEA) on a dealuminated beta zeolite for catalysis
Anchoring highly dispersed metal nanoparticles by strong electrostatic adsorption (SEA) on a dealuminated beta zeolite for catalysis Open
Enhanced interaction between metal precursors and silanol nests was demonstrated on a silanol-rich dealuminated beta zeolite by strong electrostatic adsorption, leading to the formation of highly dispersed Ni nanoparticles for effective ca…
View article: Pt Nanoparticles on Beta zeolites for Catalytic Toluene Oxidation: Effect of the Hydroxyl Groups of Beta Zeolite**
Pt Nanoparticles on Beta zeolites for Catalytic Toluene Oxidation: Effect of the Hydroxyl Groups of Beta Zeolite** Open
Stabilisation of metal species using hydroxyl‐rich dealuminated zeolites is a promising method for catalysis. However, insights into the interactions between the hydroxyl groups in zeolite and noble metals and their effects on catalysis ar…
View article: Origin of the superior oxygen reduction activity of zirconium nitride in alkaline media
Origin of the superior oxygen reduction activity of zirconium nitride in alkaline media Open
This work identifies a new mechanism for the origin of the superior ORR activity of ZrN in alkaline media, combining electrochemical surface state analysis, density functional theory, and pH-dependent microkinetic modeling.
View article: Catalytic Pyrolysis of High-Density Polyethylene (Hdpe) Over Hierarchical Zsm-5 Zeolites Produced by Microwave-Assisted Chelation-Alkaline Treatment
Catalytic Pyrolysis of High-Density Polyethylene (Hdpe) Over Hierarchical Zsm-5 Zeolites Produced by Microwave-Assisted Chelation-Alkaline Treatment Open
View article: Water cluster characteristics of fuel cell gas diffusion layers with artificial microporous layer crack dilation
Water cluster characteristics of fuel cell gas diffusion layers with artificial microporous layer crack dilation Open
The formation of discrete water clusters in polymer electrolyte fuel cell gas diffusion layers (GDL) can lead to increased resistance for oxygen transport in the catalyst layer. This study investigates the effect of MPL crack propagation o…
View article: Synthesis of phosphonated graphene oxide by electrochemical exfoliation to enhance the performance and durability of high-temperature proton exchange membrane fuel cells
Synthesis of phosphonated graphene oxide by electrochemical exfoliation to enhance the performance and durability of high-temperature proton exchange membrane fuel cells Open
The doping of functionalized graphene oxide (GO) in the membranes becomes a promising method for improving the performance of high-temperature proton exchange membrane fuel cells (HT-PEMFC). Phosphonated graphene oxide (PGO) with a P/O rat…
View article: Porous silica nanosheets in PIM-1 membranes for CO2 separation
Porous silica nanosheets in PIM-1 membranes for CO2 separation Open
View article: Graphene/carbon structured catalyst layer to enhance the performance and durability of the high-temperature proton exchange membrane fuel cells
Graphene/carbon structured catalyst layer to enhance the performance and durability of the high-temperature proton exchange membrane fuel cells Open
View article: Thin film nanocomposite membranes of PIM-1 and graphene oxide/ZIF-8 nanohybrids for organophilic pervaporation
Thin film nanocomposite membranes of PIM-1 and graphene oxide/ZIF-8 nanohybrids for organophilic pervaporation Open
View article: Utilization of 3D printed carbon gas diffusion layers in polymer electrolyte membrane fuel cells
Utilization of 3D printed carbon gas diffusion layers in polymer electrolyte membrane fuel cells Open
3D printing and carbonisation is used to produce designed gas diffusion layer materials for polymer electrolyte membrane fuel cells (PEMFC). Using a desktop UV 3D printer, designed porous microstructures are printed with micro and macro-sc…
View article: Elucidation of the removal of trivalent and divalent heavy metal ions from aqueous solutions using hybrid-porous composite ion-exchangers by nonlinear regression
Elucidation of the removal of trivalent and divalent heavy metal ions from aqueous solutions using hybrid-porous composite ion-exchangers by nonlinear regression Open
View article: Discrete-Particle Model to Optimize Operational Conditions of Proton-Exchange Membrane Fuel-Cell Gas Channels
Discrete-Particle Model to Optimize Operational Conditions of Proton-Exchange Membrane Fuel-Cell Gas Channels Open
Operation of proton-exchange membrane fuel cells is highly deteriorated by mass transfer loss, which is a result of spatial and temporal interaction between airflow, water flow, channel geometry, and its wettability. Prediction of two-phas…
View article: Insights into the performance and degradation of polybenzimidazole/muscovite composite membranes in high–temperature proton exchange membrane fuel cells
Insights into the performance and degradation of polybenzimidazole/muscovite composite membranes in high–temperature proton exchange membrane fuel cells Open
View article: Lab-based X-ray micro-computed tomography coupled with machine-learning segmentation to investigate phosphoric acid leaching in high-temperature polymer electrolyte fuel cells
Lab-based X-ray micro-computed tomography coupled with machine-learning segmentation to investigate phosphoric acid leaching in high-temperature polymer electrolyte fuel cells Open
View article: Utilizing Faujasite-type zeolites prepared from waste aluminum foil for competitive ion-exchange to remove heavy metals from simulated wastewater
Utilizing Faujasite-type zeolites prepared from waste aluminum foil for competitive ion-exchange to remove heavy metals from simulated wastewater Open
View article: Utilization of Nagarparker kaolin for the synthesis of zeolite-zsm, a value added product
Utilization of Nagarparker kaolin for the synthesis of zeolite-zsm, a value added product Open
Nagarparker arid zone of Pakistan. It has large deposits of Kaolin (China Clay) approximately 4.3 million tons. Crystal zeolite ZSM produced and characterized. Material ground, calcined dehydrated using ball mill, autoclave and furnace res…
View article: High-performance polymer electrolyte membranes incorporated with 2D silica nanosheets in high-temperature proton exchange membrane fuel cells
High-performance polymer electrolyte membranes incorporated with 2D silica nanosheets in high-temperature proton exchange membrane fuel cells Open
Silica nanosheets (SN) derived from natural vermiculite (Verm) were successfully incorporated into polyethersulfone–polyvinylpyrrolidone (PES–PVP) polymer to fabricate high–temperature proton exchange membranes (HT–PEMs). The content of SN…
View article: Oleylamine Aging of PtNi Nanoparticles Giving Enhanced Functionality for the Oxygen Reduction Reaction
Oleylamine Aging of PtNi Nanoparticles Giving Enhanced Functionality for the Oxygen Reduction Reaction Open
We report a rapid solution-phase strategy to synthesize alloyed PtNi nanoparticles which demonstrate outstanding functionality for the oxygen reduction reaction (ORR). This one-pot coreduction colloidal synthesis results in a monodisperse …